Equity (Details)		3 Months Ended		23 Months Ended
		Mar. 31, 2016 USD ($) plan $ / shares shares	Mar. 31, 2015 USD ($) shares	Mar. 31, 2016 USD ($) $ / shares shares	Dec. 31, 2015 USD ($)	Dec. 31, 2014 USD ($)	May. 12, 2014 USD ($)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of share-based compensation plans | plan		3
Outstanding assumed options (in shares) | shares		70,000		70,000
Shares authorized (in shares) | shares		26,500,000		26,500,000
Common stock shares issued (in shares) | shares		20,406	11,321
Shares issued for services performed | $		$ 173,000	$ 108,000
Total unrecognized compensation expense | $		$ 4,501,863		$ 4,501,863
Number of shares [Roll forward]
Outstanding, beginning of period (in shares) | shares		14,019,629
Granted (in shares) | shares		0
Exercised (in shares) | shares		(608,717)
Unvested options forfeited (in shares) | shares		(120,563)
Vested options expired (in shares) | shares		(12,497)
Outstanding, end of period (in shares) | shares		13,277,852		13,277,852
Vested at end of period (in shares) | shares		11,714,483		11,714,483
Exercisable options, vested and expected to vest (in shares) | shares	[1]	13,210,155		13,210,155
Weighted-Average Exercise Price [Roll forward]
Outstanding, weighted average exercise price, beginning of period (in dollars per share)		$ 3.62
Granted, weighted average exercise price (in dollars per share)		0.00
Exercised, weighted average exercise price (in dollars per share)		1.87
Unvested options forfeited weighted-average exercise price (in dollars per share)		6.05
Vested options expired weighted-average exercise price (in dollars per share)		6.34
Outstanding, weighted average exercise price, end of period (in dollars per share)		3.69		$ 3.69
Vested at end of period weighted average exercise price (in dollars per share)		3.24		3.24
Vested and expected to vest, weighted average exercise price (in dollars per share)	[1]	$ 3.67		$ 3.67
Stock options, additional disclosures [Abstract]
Vested at end of period weighted average remaining contractual term		6 years 1 month 6 days
Vested and expected to vest, weighted average remaining contractual term	[1]	6 years 3 months 18 days
Outstanding intrinsic value | $		$ 67,341,642		$ 67,341,642
Vested at end of period aggregate intrinsic value | $		64,456,036		64,456,036
Vested and expected to vest, aggregate intrinsic value | $	[1]	67,231,821		$ 67,231,821
Exercised options, intrinsic value | $		$ 4,440,694
Number of outstanding options (in shares) | shares		13,277,852		13,277,852
Outstanding Options, weighted average remaining contractual term		6 years 3 months 18 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 3.69		$ 3.69
Number of exercisable options (in shares) | shares		11,714,483		11,714,483
Exercisable Options, weighted average exercise price (in dollars per share)		$ 3.24		$ 3.24
Fair value options valuation assumptions [Abstract]
Expected volatility Minimum			56.80%
Expected volatility Maximum			58.10%
Expected life (in years)			6 years
Expected dividend yield			0.00%
Risk-free interest rate Minimum			1.57%
Risk-free interest rate Maximum			1.66%
Share-based Compensation [Abstract]
Share-based compensation expense | $		$ 4,615,000	$ 3,933,000
Authorized share amount for repurchase | $					$ 60,000,000	$ 20,000,000	$ 10,000,000
Stock repurchase (in shares) | shares		415,252
Payments for repurchase of common stock, net | $		$ 3,518,000
Brokerage commissions | $		12,000
Shares repurchased, value | $		3,530,000	12,295,000	$ 49,244,000
Remaining authorizations under the repurchase program | $		$ 10,756,000		10,756,000
Shares reissued from the treasury | shares		2,529,444
Shares reissued from the treasury, value | $		$ 20,746,000
Cost of Products Sold
Share-based Compensation [Abstract]
Share-based compensation expense | $		96,000	95,000
Research and Development
Share-based Compensation [Abstract]
Share-based compensation expense | $		205,000	186,000
Selling, General and Administrative
Share-based Compensation [Abstract]
Share-based compensation expense | $		4,314,000	$ 3,652,000
Restricted Stock Awards
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Total unrecognized stock-based compensation related to time-based, nonvested restricted stock | $		$ 24,965,395		$ 24,965,395
Expenses expected to be recognized over a weighted-average period (in years)		2 years 3 months 18 days
Number of Shares
Beginning Balance | shares		2,613,267
Granted | shares		1,576,579
Vested | shares		(644,903)
Forfeited | shares		(45,263)
Ending Balance | shares		3,499,680		3,499,680
Weighted- Average Grant Date Fair Value
Beginning Balance (in dollars per share)		$ 9.14
Granted (in dollars per share)		8.18
Vested (in dollars per share)		8.42
Forfeited (in dollars per share)		8.87
Beginning Balance (in dollars per share)		$ 8.84		$ 8.84
Share-based Compensation [Abstract]
Shares paid for tax withholding | shares		81,594
$0.50 - $0.76
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		$ 0.50
Exercise Price Range, upper range limit (in dollars per share)		$ 0.76
Number of outstanding options (in shares) | shares		441,429		441,429
Outstanding Options, weighted average remaining contractual term		3 years 2 months 12 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 0.72		$ 0.72
Number of exercisable options (in shares) | shares		441,429		441,429
Exercisable Options, weighted average exercise price (in dollars per share)		$ 0.72		$ 0.72
$0.87 - $1.35
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		0.87
Exercise Price Range, upper range limit (in dollars per share)		$ 1.35
Number of outstanding options (in shares) | shares		4,431,970		4,431,970
Outstanding Options, weighted average remaining contractual term		5 years 4 months 24 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 1.19		$ 1.19
Number of exercisable options (in shares) | shares		4,431,970		4,431,970
Exercisable Options, weighted average exercise price (in dollars per share)		$ 1.19		$ 1.19
$1.40 - $2.45
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		1.40
Exercise Price Range, upper range limit (in dollars per share)		$ 2.45
Number of outstanding options (in shares) | shares		1,460,924		1,460,924
Outstanding Options, weighted average remaining contractual term		4 years 8 months 12 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 1.92		$ 1.92
Number of exercisable options (in shares) | shares		1,460,924		1,460,924
Exercisable Options, weighted average exercise price (in dollars per share)		$ 1.92		$ 1.92
$2.66 - $3.99
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		2.66
Exercise Price Range, upper range limit (in dollars per share)		$ 3.99
Number of outstanding options (in shares) | shares		894,120		894,120
Outstanding Options, weighted average remaining contractual term		6 years 7 months 6 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 3.06		$ 3.06
Number of exercisable options (in shares) | shares		894,120		894,120
Exercisable Options, weighted average exercise price (in dollars per share)		$ 3.06		$ 3.06
$4.19 - $6.38
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		4.19
Exercise Price Range, upper range limit (in dollars per share)		$ 6.38
Number of outstanding options (in shares) | shares		3,426,178		3,426,178
Outstanding Options, weighted average remaining contractual term		7 years 2 months 12 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 5.35		$ 5.35
Number of exercisable options (in shares) | shares		2,897,570		2,897,570
Exercisable Options, weighted average exercise price (in dollars per share)		$ 5.26		$ 5.26
$6.45 - $9.78
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		6.45
Exercise Price Range, upper range limit (in dollars per share)		$ 9.78
Number of outstanding options (in shares) | shares		2,512,065		2,512,065
Outstanding Options, weighted average remaining contractual term		7 years 10 months 24 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 7.29		$ 7.29
Number of exercisable options (in shares) | shares		1,556,144		1,556,144
Exercisable Options, weighted average exercise price (in dollars per share)		$ 7.24		$ 7.24
$9.90- $10.99
Stock options, additional disclosures [Abstract]
Exercise Price Range, lower range limit (in dollars per share)		9.90
Exercise Price Range, upper range limit (in dollars per share)		$ 10.99
Number of outstanding options (in shares) | shares		111,166		111,166
Outstanding Options, weighted average remaining contractual term		8 years 7 months 6 days
Outstanding Options, weighted average exercise price (in dollars per share)		$ 10.44		$ 10.44
Number of exercisable options (in shares) | shares		32,326		32,326
Exercisable Options, weighted average exercise price (in dollars per share)		$ 10.51		$ 10.51
Assumed 2006 Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock shares issued (in shares) | shares		20,406
Shares issued for services performed | $		$ 173,000

[1] Includes forfeiture adjusted unvested shares.